From f6deeb4b25ef1afc8dff4fdf6687b033642c37ca Mon Sep 17 00:00:00 2001 From: Sean Whalen Date: Sun, 26 Apr 2026 16:00:39 -0400 Subject: [PATCH] README: declare base_reverse_dns_map.csv under CC BY-SA 4.0 The map is now a curated derivative of the bundled IPinfo Lite MMDB (as_domain / as_name fields, walked for unmapped operators and classified via the workflow in AGENTS.md). IPinfo Lite is licensed under Creative Commons Attribution-ShareAlike 4.0, which propagates to derivative works, so the CSV is distributed under CC BY-SA 4.0 with attribution to IPinfo for the underlying network identification data. Also updates the file-size estimate in the README from "over 1,400" to "over 5,000" to reflect the current state. Co-Authored-By: Claude Opus 4.7 (1M context) --- parsedmarc/resources/maps/README.md | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/parsedmarc/resources/maps/README.md b/parsedmarc/resources/maps/README.md index c371921..39c1c83 100644 --- a/parsedmarc/resources/maps/README.md +++ b/parsedmarc/resources/maps/README.md @@ -71,7 +71,19 @@ The `service_type` is based on the following rule precedence: - Utilities - Web Host -The file currently contains over 1,400 mappings from a wide variety of email sending sources. +The file currently contains over 5,000 mappings from a wide variety of email sending sources. + +### License + +`base_reverse_dns_map.csv` is a curated derivative work. Many entries +are derived from the bundled IPinfo Lite MMDB (`as_domain` and +`as_name` fields) by walking the database for unmapped operators and +classifying them via the workflow described in [AGENTS.md](../../../AGENTS.md). +Because IPinfo Lite is licensed under +[Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0)](https://creativecommons.org/licenses/by-sa/4.0/), +this CSV is also distributed under **CC BY-SA 4.0** with attribution to +[IPinfo](https://ipinfo.io/) for the underlying network identification +data. ## known_unknown_base_reverse_dns.txt